The figure appears to be a circle with a diameter of 50 km.
The radius of a circle is half of its diameter, therefore, the radius of the given circle is 25 km.
Let's recall the formula in getting the area of a circle:
[tex]\text{ A = }\pi r^2[/tex]
We get,
[tex]\text{ A = }\pi r^2[/tex][tex]\text{ A = (3.14)(25)}^2[/tex][tex]\text{ = (3.14)(625)}[/tex][tex]\text{ A = }1,962.50km^2[/tex]
Therefore, the area of the circle is 1,962.50 km^2.
